Sintered NdFeB magnets are well known for being highly susceptible to oxidation and corrosion, which can eventually lead to a decline—or even a complete loss—of magnetic performance. For this reason, proper surface protection is essential before the magnets are put into use. In one of our previous articles, Preventing Corrosion: The Essential Guide to Neodymium Magnet Coating/Plating, we introduced the major surface-finishing options for sintered NdFeB magnets. In addition to electroplating, NdFeB magnets can also be treated using electroless plating,

Certification is essentially a form of quality and credibility assurance. According to the definitions provided by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), certification refers to a conformity assessment activity in which an accredited certification body verifies that a company’s products, services, or management systems comply with relevant standards, technical specifications (TS), or mandatory requirements. The benefits of certification are clear: It serves as the “credit passport” of a product, a “health check report” of

In our earlier article on Mitigating Eddy Current Losses in Rare-earth Permanent Magnets, we explained why eddy currents occur and how they can lead to heat generation and demagnetization in high-speed motors. Building on that foundation, this article introduces one of the most effective engineering solutions for reducing eddy current loss—magnet segmentation. A magnet produced using segmentation technology is often referred to as a laminated magnet, segmented magnet, or sectioned magnet. The concept is straightforward: instead of using a single

How NdFeB Magnets Are Tested: Surface Field, Flux, Magnetic Moment, and Density Today, we will focus on the principles and methods used for relative magnetic property testing of sintered NdFeB magnets. NdFeB products come in many different shapes and sizes, and while most customers specify the magnetic grade, some also request comparative magnetic performance tests on samples. Typical customer requests may include: checking the surface magnetic field, measuring the magnetic flux, or verifying the magnetic moment of selected magnets. To

Origin of Magnetism in Permanent Magnets The magnetic properties of permanent magnets primarily come from their crystal structure, which allows them to become strongly magnetized. Even after the external magnetic field is removed, the magnet retains its magnetism. Therefore, the magnetization process (also called charging or polarization) is a critical step for permanent magnetic materials such as NdFeB (Neodymium-Iron-Boron) to obtain and exhibit strong magnetism. Isotropic vs. Anisotropic Magnets Magnetic materials can be classified into isotropic and anisotropic magnets: Type